Reconciliation assertion during cursor update for VLCS

++ SEGFAULT_SIGNALS=all

++ nice catchsegv ./t -1 -c ../../../test/format/CONFIG.stress file_type=var leaf_page_max=9 internal_page_max=9 value_min=256

[1544016591:689775][13079:0x3ff96fff910], t, file:wt.wt, WT_CURSOR.update: __rec_col_var, 4185: F_ISSET(r, WT_REC_UPDATE_RESTORE)

[1544016591:689826][13079:0x3ff96fff910], t, file:wt.wt, WT_CURSOR.update: __wt_abort, 30: aborting WiredTiger library

t: process 13079

(...)

Backtrace:

/lib64/libc.so.6(gsignal+0x40)[0x3ffb0f40a78]

/lib64/libc.so.6(abort+0x128)[0x3ffb0f42300]

/mnt/workspace/wiredtiger-test-format-stress-zseries/build_posix/../src/os_common/os_alloc.c:34(__wt_calloc)[0x8006b018]

/mnt/workspace/wiredtiger-test-format-stress-zseries/build_posix/../src/reconcile/rec_write.c:4191(__rec_col_var)[0x800938b4]

/mnt/workspace/wiredtiger-test-format-stress-zseries/build_posix/../src/reconcile/rec_write.c:447(__wt_reconcile)[0x80089b56]

/mnt/workspace/wiredtiger-test-format-stress-zseries/build_posix/../src/evict/evict_page.c:684(__evict_review)[0x80056326]

/mnt/workspace/wiredtiger-test-format-stress-zseries/build_posix/../src/evict/evict_page.c:174(__wt_evict)[0x80054606]

/mnt/workspace/wiredtiger-test-format-stress-zseries/build_posix/../src/evict/evict_lru.c:2322(__evict_page)[0x800505f4]

/mnt/workspace/wiredtiger-test-format-stress-zseries/build_posix/../src/evict/evict_lru.c:2417(__wt_cache_eviction_worker)[0x80050c12]

/mnt/workspace/wiredtiger-test-format-stress-zseries/build_posix/../src/include/cache.i:453(__wt_cache_eviction_check)[0x8010a17a]

/mnt/workspace/wiredtiger-test-format-stress-zseries/build_posix/../src/include/cursor.i:152(__cursor_enter)[0x8010c9be]

/mnt/workspace/wiredtiger-test-format-stress-zseries/build_posix/../src/include/cursor.i:357(__cursor_func_init)[0x8010cd58]

/mnt/workspace/wiredtiger-test-format-stress-zseries/build_posix/../src/btree/bt_cursor.c:1286(__btcur_update)[0x8011054e]

/mnt/workspace/wiredtiger-test-format-stress-zseries/build_posix/../src/btree/bt_cursor.c:1580(__wt_btcur_update)[0x801115da]

/mnt/workspace/wiredtiger-test-format-stress-zseries/build_posix/../src/cursor/cur_file.c:366(__curfile_update)[0x8019ab34]

/mnt/workspace/wiredtiger-test-format-stress-zseries/build_posix/test/format/../../../test/format/ops.c:1793(col_update)[0x8000ead8]

/mnt/workspace/wiredtiger-test-format-stress-zseries/build_posix/test/format/../../../test/format/ops.c:1013(ops)[0x8000c418]

/lib64/libpthread.so.0(+0x81f2)[0x3ffb12881f2]

/lib64/libc.so.6(+0x1098da)[0x3ffb10098da]

############################################

#  RUN PARAMETERS

############################################

abort=0

alter=0

auto_throttle=1

backups=1

bitcnt=5

bloom=1

bloom_bit_count=5

bloom_hash_count=26

bloom_oldest=0

cache=110

cache_minimum=20

checkpoints=on

checkpoint_log_size=96

checkpoint_wait=98

checksum=uncompressed

chunk_size=10

compaction=0

compression=zlib

data_extend=0

data_source=table

delete_pct=34

dictionary=0

direct_io=0

encryption=none

evict_max=2

file_type=variable-length column-store

firstfit=0

huffman_key=0

huffman_value=0

independent_thread_rng=1

in_memory=0

insert_pct=4

internal_key_truncation=1

internal_page_max=9

isolation=random

key_gap=2

key_max=44

key_min=26

leaf_page_max=9

leak_memory=0

logging=0

logging_archive=1

logging_compression=none

logging_file_max=419739

logging_prealloc=1

long_running_txn=0

lsm_worker_threads=3

memory_page_max=5

merge_max=14

mmap=1

modify_pct=0

ops=0

prefix_compression=1

prefix_compression_min=8

prepare=1

quiet=1

read_pct=1

rebalance=1

repeat_data_pct=77

reverse=0

rows=1000000

runs=1

salvage=1

split_pct=52

statistics=0

statistics_server=0

threads=11

timer=4

timing_stress_checkpoint=0

timing_stress_lookaside_sweep=0

timing_stress_split_1=0

timing_stress_split_2=0

timing_stress_split_3=0

timing_stress_split_4=0

timing_stress_split_5=0

timing_stress_split_6=0

timing_stress_split_7=0

timing_stress_split_8=0

transaction_timestamps=1

transaction-frequency=51

truncate=1

value_max=696

value_min=256

verify=1

wiredtiger_config=

write_pct=61

############################################